Empidonax hammondii
Silhouette: Emily Willoughby · PhyloPic
In 3 days ~10% in a week ~20%
Hammond's flycatcher (Empidonax hammondii) is a flycatcher in the family Tyrannidae. This small insectivorous bird inhabits the coniferous and mixed forests of western North America. The name of this bird commemorates William Alexander Hammond who was the surgeon general of the US Army. Hammond collected bird specimens for Spencer Fullerton Baird.
Adults are 12–14 cm long (4.7–5.5 in), span about 22 cm (8.7 in) across the wing and weigh 8–12 g (0.3–04 oz). They have grayish-olive upperparts, darker on the wings and tail, with whitish underparts; they have a conspicuous white eye ring, white wing bars, a small bill and a short tail. The breast is washed with grey and the sides of the belly with yellow. Females usually have a shorter, wider bill than males. Immature birds are similar to adults, but have broader wing bars and are more buff.
Many species of Empidonax flycatchers are very similar in appearance. Hammond's flycatchers are mainly confused with Dusky (E. oberholseri) and Gray (E. wrightii) flycatchers, which are similar in color and size and have an overlapping range. The best way to distinguish Hammond's flycatcher is by its call, breeding habitat and/or range... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Toluca | 🇲🇽 México | |
| 2 | Mexico City | 🇲🇽 México | |
| 3 | Puebla | 🇲🇽 México | |
| 4 | Guadalajara | 🇲🇽 México | |
| 5 | Guatemala City | 🇬🇹 Guatemala | |
| 6 | Vancouver | 🇨🇦 Canada | |
| 7 | Portland | 🇺🇸 United States | |
| 8 | Los Angeles | 🇺🇸 United States | |
| 9 | Mesa | 🇺🇸 United States | |
| 10 | Salt Lake City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Hammond's Flycatcher sighting in Reserva de la Biosfera Mariposa Monarca on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 90th most-seen of the 103 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
February
In that month about 10% of wildlife watchers report a Hammond's Flycatcher in Reserva de la Biosfera Mariposa Monarca on a given day, against under 5% in March, May and October–January, the lowest months. That is one of Reserva de la Biosfera Mariposa Monarca's driest months, with about 30 mm of rain against 270 mm in July. April and June–September have too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Hammond's Flycatcher sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
14th of 27
Of the 27 parks where we can rate Hammond's Flycatcher sightings, Reserva de la Biosfera Mariposa Monarca ranks 14th at under 5%. The best odds are in Glacier National Park (United States, about 20%), El Triunfo (Mexico, about 10%) and Sequoia and Kings Canyon National Parks (United States, about 10%).
Same genus: Empidonax
The closest relatives of the Hammond's Flycatcher that you can see in Reserva de la Biosfera Mariposa Monarca (genus Empidonax, Empidonax Flycatchers) are Pacific-slope Flycatcher (about 10%), Buff-breasted Flycatcher (about 10%) and Pine Flycatcher (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Hammond's Flycatcher is recorded against all the birds logged in Reserva de la Biosfera Mariposa Monarca (7 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
